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Long-Term Debt - Debt Finance Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2011
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Dec. 31, 2013
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Dec. 31, 2012
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| Debt Instrument [Line Items] | ||||
| Debt finance costs incurred | $ 7 | $ 16 | $ 21 | |
| Repayment penalty on term loans | 5 | |||
| Amortized additional discount on early repayment of debt | 5 | |||
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2012 Secured Credit Agreement [Member]
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| Debt Instrument [Line Items] | ||||
| Repayment penalty on term loans | $ 5 | |||